link 6.x-2.7

security by dropcube: fixes security problem for Separate title and URL formatter. SA-CONTRIB-2009-096 - Link - Cross Site Scripting
Fix for bug #587078: Initializing item attributes as array if it is not set to avoid Unsupported operand types error.
Unserialize attributtes array if it has not been unserialized during sanitization.
Patch #580988, hook_field('load',...) should return an array of additions to be added to the node object. Ensures that data get cached correctly.
Fixed bug #516310, by frega, svogel and dropcube: Initialized the attributes array correctly, and populated it with default values.
- Adding constants to define links target attribute.